package com.longg.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.util.Map;

@WebFilter(value = {"/user/*","/dept/*","/article/*","/meeting/*"},dispatcherTypes = {DispatcherType.FORWARD,DispatcherType.REQUEST})
public class LoginFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) servletRequest;
        HttpServletResponse resp = (HttpServletResponse) servletResponse;
        HttpSession session = req.getSession();
        String sId = session.getId();
        Object attribute = session.getAttribute(sId);
        if(null == attribute){
            resp.sendRedirect(req.getContextPath() + "/index.jsp");
            return;
        }
        filterChain.doFilter(req,resp);
    }

    @Override
    public void destroy() {

    }
}
